Chloro(di-2-pyridyl-κN-amine)(propionato-κ²O,O')copper(II) monohydrate

Copper(II) interacting with the non-steroidal antiinflammatory drug flufenamic acid: Structure, antioxidant activity and binding to DNA and albumins

“…4). The interplanar distance of bipyam ligand plane is 3.286 Å a value close to the one (3.341 Å) observed in [76].These type of hydrogen bond interactions are observed for neighboring complexes with formula [Cu(II)(bipyam)(RCO 2 )Cl] studied in [70][71][72]. With the exception of those studied in [72] and [77], all the other complexes form dimers of the type observed in 2.…”

“…In both of these cases the chelating oxygens participate in five-membered rings and the bite angles are 81.65° and 81.84° respectively, significantly greater than the analogous O-Cu-O bite angle in 2 (Table 3), which is formed by oxygen atoms participating in four-membered rings. In 2, the angle between the planar pyridine rings of the bipyam ligands is 5.80°, slightly larger than those in complexes studied in [70,71,[73][74][75][76] which are lower than 4.0°. For the complexes studied in [72] and [77], this angle takes the values 12.20° and 9.06° respectively.…”

“…The tetragonality T 5 = 0.803 [67], along with the trigonality index τ = (155.44°-155.38°)/60° = 0.001 [68], show slight distortion from the regular square-based pyramidal geometry. The chelate rings formed by nitrogen atoms N (11) and N (12) 12) bite angle of bipyam (94.16(7)°) and those of the chelating atoms to Cu (Table 3) fall in the range of angles found in similar complexes [70][71][72][73][74][75][76][77]. An interesting feature concerns the bite angle values and planarity of bipyam chelating ligand with respect to the ligands completing the coordination sphere of Cu ion.…”

(Acetato-κ2O,O′)(di-2-pyridylamine-κN)(trifluoroacetato-κO)copper(II)

“…In its complexes with copper(II), the structures of mononuclear and polynuclear compounds have been reported. In most mononuclear complexes, the Cu II atom is surrounded by two chelating dpa ligands and some anions (Johnson & Jacobson, 1973;Jacobson & Jensen, 1986;Akhter et al, 1991;Hill et al, 1997;Youngme et al, 1998Youngme et al, , 1999; bridged dinuclear species are also reported in a few compounds, such as oxamidate (oa)-bridged [Cu 2 (dpa) 2 (oa)-(NO 3 ) 2 ] 6 and dihydroxo-bridged [Cu 2 (dpa) 2 (OH) 2 (BF 4 ) 2 ] and [Cu(dpa) 2 (OH) 2 (H 2 O)]Cl 2 Á2H 2 O (Wu et al, 1992). In recent years, increasing attention has been paid to the dpa ligand because it is used as a basic material for metal chain complexes.…”